Tool handle



March 5, 1935. HAVENER 7 1,993,170

TOOL HANDLE Filed May 8, 1953 -r v ,l /4

Patented Mar. 5, 1935 UNITED STATES 1,993,170 roof. mums Arthur 1:.Banner, Wayland, Mus alcignor to Judson L. Thomson Manufacturing 00.,Waltham, Mala, a corporation of Massachusetts Application my s, 1933,Serial No. 669,920

ZClaims.

This invention relates to handles for tools and implements of variouskinds and is exemplified in a knife handle.

Heretofore it has been customary to fasten handle portions to the shanksof tools by the use I of rivets of various forms. A common practice hasbeen to use two piece rivets and to fasten the handle portions at threedifferent points by three separate operations since no satisfactorymeans have heretofore been devised for setting all the two piece rivetssimultaneously without incurring the risk of one or more defectivesettings. Separate settings, however, slow down the fastening operationsand increase the expense thereof.

One of the important objects of the invention is the provision of a twopiece rivet of such form as to permit all the rivets to be setsimultaneously without any risk of defective settings.

Another object is the provision of a method for fastening handleportions to the shank of a tool at a plurality of points simultaneouslyin order to reduce the cost of the operation.

A further object is to provide a method which 26 permits a cheaper rivetto be used without detracting from the durability and efficiency of thefastening means.

Other objects of the invention will in part be obvious and in partappear in the following description.

The invention accordingly comprises an article of manufacture having thenovel features and arrangement of elements and a method for producing itcomprising the various steps as exemplifled in the following descriptionand pointed out in the In the accompanying drawing illustrating theembodiment of my invention in a knife handle, Figure 1 is a top planview of the handle portion and part of the blade of a knife; Fig. 2 is aside or edgewise elevation of the same; Figs. 3 to 6 inclusive arelongitudinal, central sectional views on an enlarged scale of a portionof the knife handle including one fastening means to illustrateprogressively the method of fastening handle portions to the shank of aknife, Fig. 3 showing the handle portions in position on the shank ofthe knife; Fig. 4 showing a tubular member inserted in'one side of thehandle; Fig. 5 showing the said tubular member after its end has beenupset within the bore; Fig. 6 showing the plug inserted in the knifehandle and having its end locked in the tubular member for a completionof the fastening operation; and Fig. 7 is a similar view illustratingthe method of fastening when the shank of the knife is provided withholes smaller than the bores in the handle portions.

Referring to the drawing, 10 indicates a knife blade having a shankportion 12 with two handle portions Hand 16 fastened thereto on oppositesides by a plurality of fastening means preferably shown as being threein number. The shank of' the knife is provided with a longitudinalseries of three holes 18 and the handle portions 14 and 16 with asimilar series of three holes or bores 20 and 22 respective1y, the outerends of said bores havi'ng countersinks 24 and 26 respectively.

-"The two handle portions are fastened to the knife shank by aplurality, preferably three, of two piece rivets, each comprising atubular member 28 into which is tightly fitted the end of a plug member30. Both members have expanded heads 32 and 34 respectively, fitting thecountersinks in the handleportions, preferably 'fiush with the outersurface thereof. The diameter of each tubular member is less than theinner diameter of the bore in which it is mounted thereby permitting itsend to be turned over or upset within the bore.

In Figure 7 is illustrated a modified structure in which the hole in theknife shank is made smaller than the bores in the handle portions inorder that when the plug is forced into the tubular member expanding it,the hole in the knife shank will be completely filled and the metal ofthe tubular member will be caused to overflow the edges of said hole onboth faces of the shank. This construction results in a very effectivelock between the shank of the knife and the two parts of the rivet andcontributes to the durability of the fastening in use.

The method of fastening the handle pieces to the shank of the knife.consists first in preparing the handle portions and the shank with aplurality of holes or bores all of the same diameter arranged in alongitudinal series so that they register when the handle portions areplaced in position on the shank and in providing said bores withcountersinks on the outer faces of .the two handle portions. The handleportions are then arranged in proper position on opposite sides of theshank and tubular members are-inserted in the bores in one side of theknife handle with their heads fitting the countersinks on that side andall their inner ends are upset simultaneously by any suitable multiplemechanism. The tubular members are of slightly less diameter in theirtubular portions than the diameter of the bores so that the upset endsfill up the bores are forced to some extent into the surrounding wallsof the bores.

The next step consists in inserting the plug members in the other sideof the knife handle anddriving eachplug into a tubular member until itshead is seated in'a countersink, all of the plugs being drivensimultaneously by any suitable multiple mechanism. To facilitate thisoperation the ends of the plugs may be tapered which, with the upsetends of the tubular members, eliminates all possibility of defectivesettings.

The foregoing method is also applicable to the modified form offastening shown in Figure '7 since the only changeis one-of result dueto the fact that the hole in the knife shank is smaller than thebores'in the handle portions.

oneoftheadvantagesofmyinventionisthat.ashortertubularmembermaybeusedthanhas been common heretofore whicheffects a material reduction inthe cost of the rivets without aproduction of finished handles and further reduces the cost thereof.

What Iclaim is:

1. Thecombination withatoolshankoiapair of handle portions on oppositesides of said shank, said shank'and said handle portions being providedwith a plurality of thmigh and through bores having countersinks on theouter face of each handle portion, the bores in said shank being smallerthan the bores in said handle portions, and means for fastening saidparts together comprisingatubularmembermo'untedineachofthebores in oneof said handle portions and having aheadseatedinthecountersinkofsaidbore, said member extending through said shank and filling thebore therein but having an outside diameter smaller than the insidediameters -of the bores in said handle portions and having an upset endin'the other handleportion adjacent said shankandaplugmountedineachoftheboresin said other handle portion and having a head seated-inthe countersink of the bore-and its end frictionally locked in saidtubular member, said tubular member being expanded thereby to fill thebore in said shank and to overlap the edges of said hole-on both facesof said shank tolock the tubular member thereto. I

2. The combination with a tool shank of a pair .of handle portions onopposite sidesof said shank,

said shank and said handle portions being provided with a plurality ofthrough and through bores,theboresinsaidshankbeingsmallerthan the boresin said handle portions, and means for fasteningsaidpartstogethereomprisinga headed tubular member moimted in each ofthe bores inone of said handle portions andextending through said shank,filling the bore therein,

andhaving itsendintheotherhandleportion' adiacent'said shank and aheaded plug mounted ineachoftheboresinsaid otherhandleportion with itsend frictionally locked in said tubular member, said tubular memberbeing expandedtherebytofilltheboreinsaidshankandtooverlaptheedgesofsaidboreonbothfacesofsaidshanktolockthetubularmemberthereto.

ARTHUR R. HAVENER.

